Image: Joanne Merriam
Two Potbelly seahorses holding tails at the Tennessee Aquarium in Chattanooga.
If you need inspiration this Valentine’s Day, look no further. Seahorses can teach humans many a lesson when it comes to courtship. They hold hands (uh, tails), change colours, swim snout-to-snout, and whirl around in unison for days before engaging in a “true courtship dance” that lasts about eight hours. What’s more, when one thing finally leads to another, it is the male of the species that becomes pregnant and carries the offspring.
Image: Clark Anderson
Bright yellow seahorse found in the Turneffe Islands, Belize
Why seahorses spend so much time courting might shed light on certain, ahem, bigger species’ courtship behaviors too: courting is a form of synchronizing of the seahorses’ movements so that both are prepared when the big day comes. This ‘big day’ is when the female is ready to deposit her eggs in the male’s brood pouch – which he has flashed before her during courtship to prove it’s empty, as if to say “no eggs here!”
This Malaysian pygmy seahorse (hippocampus bargibanti) proves that seahorses are masters of camouflage
The eggs then hatch in the male seahorse’s brood pouch for about two to four weeks, depending on the species. The female does not withdraw at this time, but visits her mate every morning to continue the courtship by wheeling around, changing colour and holding her mate’s tail. This support fosters a monogamous relationship, at least during one reproductive phase, that keeps the male motivated to nurture and the female to continue producing eggs.
Offspring survival rates are low: only about 5 of each 1,000 infants reach maturity. This explains why seahorse litters can be large – from a few dozen, to hundreds, to as much as 1,500. But seahorse babies’ chances are still better than that of many fish because of the incubation time in the father’s pouch, during which they are protected and receive ample oxygen supply. The male seahorse, though not lactating, even produces prolactin, the same hormone found in pregnant women.